These derivatives are readily obtained by alkylation of 2 - mercaptopyridine and alkyl halides under alkaline conditions.这些衍生物可以容易地在碱性条件下通过 2- 巯基吡啶和卤代烷的烷基化而得到.The different contents of various alkylation products were ob...
The Octane Number is retained owing to HZSM 5 � � s excellent ability of aromatization, isomerization and alkylation.HZSM-5沸石对汽油的降烯烃作用得益于其优异的芳构化 、 异构化和烷基化性能.These derivatives are readily obtained by alkylation of 2 - mer...
I kept hearing the sound of applause in the background.我不断听到隐约的鼓掌声。Her dancing brought loud cheers, wolf whistles and applause.她的舞蹈赢来震耳的欢呼声、口哨声和掌声。He acknowledged the applause with a small bow.他微微地鞠了一躬表示对掌声的感谢。...
The mighty empire finally crumbled.这个强大的帝国最终瓦解了。Our hopes crumbled when the business went bankrupt.商行破产了, 我们的希望也破灭了。A clod of silt can easily be crumbled in the fingers.手指能很容易把一块泥土粉碎.She squeezed the corn puffs and they ...
他是个固执的孩子.He is a stubborn child.他是个固执的孩子, 总是坚持自己的权力和主意.He is an assertive boy, always insisting on his own rights and opinions.他轻轻地搔着甲虫光滑的壳，但这只固执的甲虫就是不动。He tickled gently at its glossy carapace,but the stubborn beetle wo...
He climbed stiffly from the Volkswagen.他浑身酸痛地从大众轿车里爬出来。I looked down at my fingers and flexed them stiffly.我僵硬地往下看着我的手指、摆弄着他们.She held up her hand stiffly...她直挺挺地举着手。He looked at Fowler , who was standing stiffly a few f...